Originally called Heunginjimun, Dongdaemun Gate (East Main Gate) is Treasure No.1. Dongdaemun Gate was built by King Taejo in 1396, renovated by King Danjong in 1453, and its present structure was built by King Gojong in 1869. The most interesting characteristic of Dongdaemun Gate is that it has a specially built outer wall, usually a half-moon shape, that surrounds a city wall. The area where Seoul Palace was built was a low region, and difficult to defend from invaders, so they built this wall to counter such disadvantages. - Visitkorea
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